Update android security patch

I transferred from from an old keyone to a new one, but the new one has an android security patch from 2017 (my old one updated in February 2019). How can I download the latest patch (and Android version) on to the new phone?
Thanks.

I transferred from from an old keyone to a new one, but the new one has an android security patch from 2017 (my old one updated in February 2019). How can I download the latest patch (and Android version) on to the new phone?
Thanks.

Go to settings, system, system update and select check for updates now.